- Country: Canada
- Genres: Mystery, Sci-Fi
- Release: 2009-03-27
- Director: Patrice Sauvé
- Writers: Frédéric Ouellet
- Language: French
- Stars: Marc Messier , Normand Daneau , Fanny Mallette , Maude Guérin , Gabrielle Lazure , Frédéric Gilles , Monique Mercure , Vassili Schneider , Marie Tifo , Evelyne Brochu
- Runtime: 104 min
- Awards: 2 wins & 15 nominations
- AKA: Grande ourse: La clé des possibles , Grande ourse : La clé des possibles (Canada) , Master Key (Sweden) , Master Key (United States of America)
- Plot: To save his best friend, Louis-Bernard Lapointe has to transport himself to a parallel world to find the 'Key of Possibilities', a magical and legendary object that allow his user to visit an infinite numbers of universes where everything is possible.
- IMDB:tt1234432
Master Key Cast · · · ALL
Patrice Sauvé
Director
Marc Messier
Louis-Bernard Lapointe
Normand Daneau
Emile Biron
Fanny Mallette
Gastonne
Maude Guérin
Evelyne O'Neal
Gabrielle Lazure
Christine Foucault
Frédéric Gilles
Charles Foucault
Monique Mercure
La centenaire
Vassili Schneider
L'enfant
Marie Tifo
Lucinda Garneau
Evelyne Brochu
Jézabel Garneau
Fanny Cournoyer
Hortense Biron
Mylène Cournoyer
Hortense Biron
Anne Dorval
Catherine Laplante
Francis Ducharme
Marc
David Gagné
Étudiant
Emmanuel Seguin
Roger Biron
Véronique Clusiau
Marie
Michel Perron
Concierge
Pierre LeBlanc
Client Librairie
Vitali Makarov
Marin
Ludivine Reding
Jeune fille au balcon